Nut-lock.



` o. ALLEN, 1R.

NUT LOCK.

APPLICATION YILBD 00T. 20, 1911.

I Patented Aug. 27, 1912.

WJTNESSE q W UM f M Zg- OGLESBY ALLEN,JR., Oft" CHICAGO, ILLINOIS,ASSIGNOR TO ALLENS NUT LOCK COMPANY, LIMITED, .A CORPORATION OFLOUISIANA.

NUT-LOCK.

specication f Letters Patent. @lamentan Aug', 27, 191g Application filedOctober 20, 1.911. Serial No. 655,776.

To all whom t may concern.'

l Be it known that I, OGLEsnY ALLEN, Jr.,

Locks, of which the following is a specification, reference being hadtherein to the accompanying drawing.

This invention relates to nut locks and has as its object to provide anut lock which will be inexpensive to manufacture, capable of beingmanipulated to lock a nut in place without the use of any tool otherthan the wrench employed in turning the nut upon its bolt, and in whichVthe locking pawls .will

be concealed and` so housed that they cannot be disengaged tromA thebolt by the insertion of a wire or sharp pointed instrument. A

For a full understanding of the invention reference is to be had to thefollowing descript-ion and accompanying drawing, in which zi Figure l isa view partly in elevation and partly-in section of the nut lockingldevice embodying the present invention. Fig. 2

. is a bottom plan view of the nut. Fig. 3 'is a side elevation of oneof the locking pawls. Fig. 4 is a similar view of the' other pawl.

Corresponding and like parts are referred to in the 'followingdescription and 'indicated in all the, views of the accompanyingdrawing` by the same reference characters.

In the drawing the numeral l indicates .l the head of the bolt and'Q thethreaded ing in the nut. rlfhese recesses are located' at opposite sidesof the bolt-opening as will be observed from inspection of Fig. 2 of thedrawings and in each of the recesses is seated one of the locking pawlsforming a part of the device.4 Each of the locking pawls comprises aHat-sided body 6 and at one end is formed with teeth 7, the opposite endbeing rounded so that the pawls may have rocking movement against theouter walls of the recesses 5. The pawls are disposed Within the-recess5 in reverse rela-A. tion as shown in Fig. 2 and after being so arrangedthe nut is to be screwed uponthe bolt until it bears firmly against theele# ment `to bc secured. It is then given a slight turn backward whichwill result in the teeth 7 bit-ing into the threads offfthe bolt, thenut being inV this manner locked against further backward rotation. Itvill be-observed thatl the, pawls are completely housed within the nutinasmuch as theg recesses do not open through the sides o'ithe nut andthey are closed at their open sides by the face of the-element which`secured by the nut and bolt, and'for this reason the pawls cannotbedisengaged from the bolt.

From inspection of the drawings it will be observed that the shorterwall of each recess is located Iin a plane which is substantially radial;with respect to the azyis of the bolt opening of the nut and thatI thelonger or opposite side wall oi each recess is located in a planeparallel to the plane of the first-mentioned wall and substan- S TESsion.

tially tangential with respect to the wall of the said bolt opening. Itwill also be observed th'at each'pawl has a relatively long and arelatively short side and that these sides" are parallel and arepresented respectively toward the last and first named walls of therecess within which the pawl is disposed. Further, it will be noted thatthe end of the pawl which is presented at the bolt opening in the nut isformed with a number of' teeth and that these teeth in- 'crease inlength from the short side of the pawl to the' long side thereof, andthat the shortest tooth of each pawl is initially in engagement with thethread of the bolt upon which the nut is fitted, the intermediate toothand the longest tooth being out of engagement with the bolt thread. lt.will be understood, however, that upon reverse rotation of the nut orthe bolt, the slight cir gagelnent of the shortest tooth with the bolt.thread will result in a canting of the pawl to such an extent as tobring its next longest or intermediatev toot-h into biting engagementwiththe bolt thread, and this tooth 'bei g longer than thefirst-mentioned tooth an 'having its biting end located a greaterdistance from the axis of the pawl, will. morefirmly dig into the boltthread thereby finally insuring of a positive ranting oit the degree asto bring its true lockingtooth into ,tielly Pe pawl and apositive'biting ofthe longest tooth deep into the bolt thread.

It will be apparent that I have notprovided a pluralityof teeth uponeach paWl for the purpose of-fsecuringa cumulative gripping eiect, buthave-provided a plural number of teeth for the purpose of insuring arotation or cahting of each pavvl to such' a firm and positiveengagexnent with the boltv Having thus described the invention what isclaiined as new is y 1. .AQ-lock nut having a bolt` opening andformedlin one face with a recess inI com Y mumcabion with thebolto'penin'g, one- Wall of thel recess lying in a plane radial withrespect tp the axis'of the bolt opening and. the oppaite wall lying inya plane substandallel to theplane of the first mentioned uiall andsubstantially tangential to the wallnvof the said bolt opening, andalockingb'awl disposed with the recess and vhaving parallel short andlong sides presentedv respectivelytoward the first and lastv mentionedWalls ofthe recess, the pawl hav- -ing an end resented 'at the Wallofthe bolt Y `openin 'an formedwith a series of teeth increasinginlength in order from the short- ?to the long side of the-pavvl andarranged to engage successively, in the order stated, with' i the threadof a bolt'litti'ng in the opening of l the nut upon reverse rotation ofthe nut or bolt, whereby the paivl Will be canted to cause itslongertooth to bite into the bolt thread.

ZA locking nut formed in one -face With recesses located at oppositesides of its bolt opening, non-corresponding Walls of the recesses beinglocatedvsubstantially in aplan'e intersectingthe axis of the boltopening and their other non-corresponding Walls being in -planes locatedat opposite sides ot' the -irstmentioned plane, and a 4pavvl looselyarranged Within each of the recesses,' each pawl having a plurality ofthread engaging teeth at its end Which'is presentedat the boltfopening,the teeth increasigin length from that one which is located adjacent therst=mentioned Wall of the recess to Athat one which is located adjacentthe :last-mentioned Wall of the recess respectively, and the shorterteeth of each pawl being arranged yto' grip and successively engage thethread of a bolt threaded into the'bolt opening7V whereby upon arotation ofthe bolt thel -lpawlsawill be canted to cause their longer.teeth to biteinto the bolt thread. I 1n testiinon 'whereof I" ihxmyrsignature in presenceo two witnesses.

` Witnesses:

` L. M. JONES, y H. W. WmoHE'sTER, n

opie's o! this patent be obtained for ve cents each, by addressing` the)Commissioner of Patents? Washingto oGLEsBY ALLEN, Je.

